Cord made from polyester filaments

Abstract

A process for manufacturing continuous polyester filament yarn for technical applications from a polymer over 90% of the chains of which are composed of ethylene terephthalate units, via a one-step spinning process, with the undrawn filaments having a crystallinity smaller than 16% and the yarn being wound at a rate larger than 6000 m/min. The yarn obtained in this fashion is particularly suitable for use as reinforcing material in rubber articles, notably as reinforcing material in pneumatic tires for cars. The polyester filament yarn can be used to make cords of uncommonly high dimensional stability and a unique combination of breaking tenacity, shrinkage, and breaking toughness.

1. A cord comprising polyester filaments, wherein the cord has the following properties:
 breaking tenacity≧570 mN/tex,  
 dimensional stability>110, and  
 quality factor>50;  
 
       and wherein the polyester filaments of the cord have the following properties:
 breaking tenacity≧650 mN/tex,  
 elongation at break>10%, and  
 breaking toughness>40 J/g.  
 
     
     
       2. The cord according to  claim 1 , wherein the quality factor is larger than 100. 
     
     
       3. The cord according to  claim 1 , wherein the quality factor is larger than 125. 
     
     
       4. The cord according to  claim 1 , wherein the quality factor is larger than 150.